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Hi Don, Spot on the money. Did not want to take up to much bandwidth, but thank you. Regards Gerald VK3GJM

Just to prove how observant I am, I now see you included the model in the title. Here's the manual, skimpy but with all the schematics and voltage table, plenty to service it. Don Black.

Hi Gerald, I don't want the scope but if you can tell me the model I may have a manual that I can email to whoever gets it. They aren't Tektronix quality but still good useful scopes. Don Black.

Hi All, I have available free of charge a very early Telequipment dual trace Oscilloscope that is complete and original. I do not know the status as I don't want to power it up. I don't have the time

Just wanted to follow up and let anybody interested know that it was indeed a bad microprocessor. Who would have guessed? I carefully removed the old 40 pin DIP, installed a nice socket, plugged in my

Another thing: since che 475 and 465 circuits are very very similar (I own a 465), the waveform on CR566 in effect is more dirty than CR556. It should rensemble the waveform of CR556 with superimposed

I found a couple of much better and complete 475 service manuals. You may want to go through the trigger adjustment procedures on page 5-18 before risking any tunnel diodes. Do not let the equipment

You're are on the good way!!!!!! The voltage on both TD's must be about 0 V. You've observed a + 500mV on CR556. O.K. CR566 seems completely off settled. The quiescent point should be 0V, not 200 mV.

I sincerely appreciate the thoughts of all that have responded in support of the site. I am certain that if my website building skills were stronger I could have probably avoided it all together.

I've noticed a more than 10 fold improvement in triggering since adjusting R565. Scope now triggers on a sine wave with attenuator at .5v/div. and trigger slope cranked all the way over clockwise. My

Today was a happy day! A good friend of mine called me on his house, because he found "some HP junk" and wanted me to drag it out. And I found a complete set of tools for 1240/12xx (color model)

<daviddigiacomo@...> wrote:

On Mon, Jan 28, 2013 at 4:27 PM, Phil Sittner <sittners@...> wrote: > I'm looking for a recommendation on what to use as a replacement for tek's 152-0242-00 diode as used in the dc restore

R565 is right, after all. I had scope in "auto", should have been in "norm". Both diodes start comutating at the same time when advancing R565. Stan

Hi Jerry. The dashed line is a standard way, in mechanical drawing/drafting, to represent something which is not visible from the current perspective. In other words, when looking at the bottom of a

152-0242-00 is reported from Tek as being 1N486A max capaciotance 10 pF, Vreverse max 225V, Vbr 240V, If max 200 mA, VF max 1V @ 100 mA Max

Yes, Max, you're right. I moved to the second channel of my student scope and could slow down the free running trace (this little scope never could trigger below 1v sig.) and note that these are

Take the knob off and try dripping it down the shaft. A little at a time and let it soak in for a while. Tom

On 01/28/2013 05:01 PM, one6146 wrote: > > Lars, > Thanks for the input. What I'm trying to figure out is a way to lubricate the switch without having to remove most of 'scopes' parts. This thing is

RFE of unknown functionality. Both have sockets, both have good getters, 5443 CRT has a small rattle. $5 to cover packaging, plus shipping from 78726. ?Will ship on your shipping account if you send